2 cups unbleached all-purpose flour 1 teaspoon baking soda 1 teaspoon baking powder 1/4 teaspoon salt 1 cup prune purée 1/2 cup plain yogurt 1/4 cup unsalted butter, softened 1/4 cup canola oil 3/4 cup brown sugar 1 teaspoon vanilla extract 2 eggs 
 1 cup walnuts, chopped and toasted 3/4 cup dried prunes, pitted…